Locking construction of electrical connection box

Abstract

A locking construction of an electrical connection box, comprising: a lower casing member which is made of resin; an upper casing member which is made of resin and is mounted on an upper portion of the lower casing member; a first locking member which has a first engageable face and is provided on the lower casing member; and a second locking member which has a second engageable face engageable with the first engageable face and is provided on the upper casing member; wherein one of the first and second engageable faces of the first and second locking members is formed by two engageable face sections having a predetermined difference in height therebetween such that the engageable face sections are sequentially brought into engagement with the other of the first and second engageable faces of the first and second locking members.

What is claimed is: 
     
       1. A locking construction of an electrical connection box, comprising: a lower casing member which is made of resin;   an upper casing member which is made of resin and is mounted on an upper portion of the lower casing member;   a first locking member which has a first engageable face and is provided on the lower casing member; and   a second locking member which has a second engageable face engageable with the first engageable face and is provided on the upper casing member;   wherein one of the first and second engageable faces of the first and second locking members is formed by two engageable face sections having a predetermined difference in height therebetween such that the engageable face sections are sequentially brought into engagement with the other of the first and second engageable faces of the first and second locking members, and said first locking member comprises said engageable face sections and said second locking member forks to two leg portions extending towards the first locking member such that said second engageable faces having an identical height are, respectively, formed on said leg portions.   
     
     
       2. The locking construction of claim 1, wherein said predetermined difference in height between said engageable faces is in the range of from about 0.8 mm to about 1.2 mm. 
     
     
       3. The locking construction of claim 1, wherein each of said leg portions comprises a boss having a wedge sectional shape, at the lower end of said leg portions. 
     
     
       4. The locking construction of claim 1, wherein at least said engageable face of said first locking member, on said lower casing, is downwardly oriented. 
     
     
       5. The locking construction of claim 4, wherein said upper casing member comprises a front face lying in a generally vertical plane, and at least said engageable face of said first locking member on said lower casing member is substantially perpendicular to the plane of said front face of said upper casing member.